{"id":1557,"date":"2020-10-29T10:17:13","date_gmt":"2020-10-29T10:17:13","guid":{"rendered":"https:\/\/hydrogenh2.cymru\/?p=1557"},"modified":"2022-02-20T14:11:56","modified_gmt":"2022-02-20T14:11:56","slug":"hydrogen-is-a-post-covid-necessity","status":"publish","type":"post","link":"https:\/\/hydrogenh2.cymru\/cy\/hydrogen-is-a-post-covid-necessity\/","title":{"rendered":"Hydrogen yn anghenraid \u00f4l-covid"},"content":{"rendered":"

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Cyhoeddwyd y blogbost hwn gyntaf ar\u00a0Nation.Cymru<\/a>\u00a0gan Robert Frater.<\/strong><\/p>\r\n

Ar hyn o bryd mae Covid-19 yn hogi\u2019r chwyddwydr trychineb Byd-eang \u2013 mae\u2019r effaith ar unigolion, teuluoedd a chymunedau yn real ac yn weledol; profiad byw ar unwaith nad oes angen rhagwelediad mawr arno i\u2019w ddeall.<\/h2>\r\n

Mae\u2019n ddealladwy felly ei fod yn dominyddu\u2019r penawdau newyddion. Ond beth o\u2019r argyfwng sy\u2019n rhedeg yn hirach y mae wedi gwthio trefn redeg yr agenda newyddion i lawr \u2013 newid yn yr hinsawdd?<\/p>\r\n

Mae effeithiau hyn yn dod yn fwyfwy amlwg \u2013 cofnodwch dymheredd uchel yr haf yn Siberia, teneuo haenau i\u00e2 yn Antarctica a\u2019r Ynys Las i enwi ond ychydig. Mae\u2019r canlyniadau\u2019n debygol o bara llawer, llawer hirach na\u2019r pandemig cyfredol.<\/p>\r\n

Mae yna lawer o ffactorau cymhleth sy\u2019n cyfrannu at newid yn yr hinsawdd, ond yn amlwg y cyfrannwr unigol mwyaf at lefelau CO cynyddol yw llosgi tanwydd ffosil. Rydym i gyd yn gwybod, pa mor effeithlon bynnag yr ydym yn ei gael wrth losgi glo, olew neu nwy, ei fod yn cyfrannu at gynhesu byd-eang \u2013 felly pam ydyn ni\u2019n parhau i wneud hynny?<\/p>\r\n

Yr ateb i\u2019r cwestiwn hwnnw yw\u2019r her y mae\u2019n rhaid i ynni gwyrdd ei datrys yn gadarn os yw am wneud gwahaniaeth mewn gwirionedd. Mewn gwirionedd, y rheswm ein bod yn dal yn gaeth i\u2019r hydrocarbonau budr hynny yw eu bod yn gyfleus; egni wedi\u2019i ddal y gellir ei ryddhau\u2019n hawdd yn \u00f4l yr angen.<\/p>\r\n

Felly a oes gan Gymru unrhyw un o\u2019r atebion i\u2019r her honno? Yr ateb yw ydy, ond dim ond os yw pobl yn gwneud iddo ddigwydd.<\/p>\r\n

Mae gan y wlad gyfleoedd gwych eisoes i ddefnyddio\u2019r technolegau ynni gwyrdd prif ffrwd cyfredol; Mae ffermydd gwynt eisoes yn safle cyfarwydd ac mae Solar wedi\u2019i sefydlu; Gellid manteisio\u2019n well ar b\u0175er tonnau ar hyd 870 milltir ein harfordir, ac mae p\u0175er llanw yn cynnig cynhyrchu ynni y gellir ei ragweld cenedlaethau ymlaen llaw (mae angen i\u2019r ysgogiadau p\u0175er gael eu rhoi yn y dwylo cywir yn unig).<\/p>\r\n

Mae gan bob un ohonynt rywfaint o effaith amgylcheddol gysylltiedig, ond ar y cyfan mae\u2019r buddion yn gorbwyso\u2019r materion.<\/p>\r\n

Y broblem fwyaf arwyddocaol gyda\u2019r holl dechnolegau hyn yw eu bod yn cynhyrchu trydan dim ond pan fydd yr amodau\u2019n ffafriol, nid o reidrwydd pan fydd ei angen arnoch. Dyma pam nad cynhyrchu, ond storio, yw\u2019r broblem gydag ynni gwyrdd; sut allwn ni storio\u2019r egni gwyrdd toreithiog hwn fel ei fod yn dod mor gyfleus \u00e2 hydrocarbonau?<\/p>\r\n

Batris<\/h3>\r\n

Efallai y bydd un ateb yn gorwedd mewn ymchwil newydd i ffotosynthesis artiffisial a gyhoeddwyd yn ddiweddar yn Nature. Mae hyn yn disgrifio sut mae dalen ffotograffig-catalytig yn defnyddio golau i adweithio carbon deuocsid a d\u0175r i gynhyrchu asid fformig ac ocsigen. Mae asid fformig yn hylif fflamadwy y gellid ei storio a\u2019i ddefnyddio yn debyg iawn i\u2019r petrocemegion sydd gennym ar hyn o bryd.<\/p>\r\n

Gall ffotosynthesis artiffisial gynnig llwybr i ddisodli petrol a disel, ond mae\u2019n rhannu problem gyda strategaeth storio ynni fwy sefydledig \u2013 batris. Mae effeithlonrwydd technoleg batri wedi gwella yn \u00f4l archebion maint dros yr ychydig ddegawdau diwethaf, boed hynny ar gyfer ein dyfeisiau electronig personol, ceir trydan, neu storio ynni masnachol.<\/p>\r\n

Yr anfantais i\u2019r ddwy dechnoleg yw\u2019r ddibyniaeth ar set arall o adnoddau cyfyngedig \u2013 elfennau fel Lithiwm, Lanthanwm neu Rhodiwm i enwi ond ychydig. Er bod rhai o\u2019r rhain yn doreithiog eu natur, mae angen mewnbwn egni sylweddol ar bob un ar gyfer echdynnu a mireinio, ac anaml y bydd prosesau mwyngloddio yn cael effaith fuddiol ar yr amgylchedd.<\/p>\r\n

Felly ble mae hynny\u2019n ein gadael ni?<\/h3>\r\n

Gall gorsafoedd p\u0175er trydan d\u0175r a bio-danwydd ddarparu trydan \u2018ar alw\u2019 ond mae ehangu capasiti cynhyrchu o\u2019r fath yn gyfan gwbl yn broblemus oherwydd cyfyngiadau daearyddiaeth a chystadleuaeth am ddefnydd tir amaethyddol. Yn eironig ddigon, gall newid yn yr hinsawdd hefyd wneud hyfywedd tymor hir y technolegau hyn yn ansicr, gan eu bod yn dibynnu ar lawiad fel man cychwyn cynhyrchu ynni.<\/p>\r\n

Ar hyn o bryd yr ateb storio ynni gwyrdd mwyaf tebygol yw cynhyrchu hydrogen trwy electrolysis. Gellir defnyddio\u2019r trydan a gynhyrchir gan ynni adnewyddadwy i rannu d\u0175r yn ei elfennau cyfansoddol \u2013 hydrogen ac ocsigen; mae\u2019r hydrogen yn cael ei ddal a\u2019i storio i\u2019w ddefnyddio\u2019n ddiweddarach.<\/p>\r\n

Mae\u2019r cysyniad o losgi nwy ar gyfer gwres, p\u0175er neu fel tanwydd yn gyfarwydd ag ef, fel y mae\u2019r seilwaith sy\u2019n ofynnol i\u2019w hwyluso. Mantais allweddol hydrogen dros ein cyflenwadau nwy confensiynol fel LPG yw ei fod yn cynhyrchu d\u0175r dim ond pan fydd yn cael ei losgi \u2013 dim mwg, huddygl na charbon deuocsid.<\/p>\r\n

Newid<\/h3>\r\n

Felly ble ydyn ni o ran newid o economi hydrocarbon i economi hydrogen?<\/p>\r\n

Mae peth cynnydd amlwg mewn mentrau fel canolfan ymchwil Prifysgol De Cymru ym Maglan lle maent yn ymchwilio i dechnolegau hydrogen ac yn creu ymwybyddiaeth o hydrogen fel ffynhonnell tanwydd gl\u00e2n, a Chymdeithas Masnach Hydrogen Cymru a lansiwyd ym mis Chwefror i gynrychioli a hyrwyddo\u2019r economi hydrogen.<\/p>\r\n

Ond er bod croeso i\u2019r mentrau hyn, ydyn nhw\u2019n mynd i\u2019r afael \u00e2\u2019r her o sut rydych chi\u2019n dechrau gwneud economi hydrogen yn ddiriaethol i\u2019r sawl sy\u2019n gwneud penderfyniadau yn y pen draw \u2013 sut maen nhw\u2019n argyhoeddi\u2019r Defnyddiwr?<\/p>\r\n

Mae angen i hydrogen fod mor gyfleus ag y mae olew nawr<\/p>\r\n

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 <\/p>\r\n","protected":false},"excerpt":{"rendered":"

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